2.2.9 [W3C-EPUB3] Section 4.4.2.3.1. Usage

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C0012: The rendition:orientation property is not supported and is ignored

The specification states:

 › 4.4.2.3.1 Usage
  
 When the rendition:orientation property is specified on a meta element, it indicates that 
 the intended orientation applies globally for the given Rendition (i.e., for all spine 
 items).

EdgeHTML Mode

The rendition:orientation property is not supported and is ignored.